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Compilation failed though equations and variables are equal in number

#7904  Permalink Top

Compilation failed though equations and variables are equal in number

Jun-20-17 20:38:19

Hi,
I'm trying to develop a distillation model. Checked the model and the no. of variables = no. of equations. Since the model is highly non linear, i gave initial guesses for some variables. When I tried to simulate, OM couldn't compile it. I'm attaching the screenshot for the same.

https://openmodelica.org/images/agorapro/attachments/5044/mini_distillation.PNG

Any possible reasons for it?  (do the start values effect compilation?)

-Swaroop

Attachments:
#7905  Permalink Top

Re: Compilation failed though equations and variables are equal in number

Jun-20-17 22:07:05

This looks like a bug in OpenModelica. Can you share the model? The error message doesn’t provide enough information to fix it. 

#7906  Permalink Top

Re: Compilation failed though equations and variables are equal in number

Jun-21-17 09:30:53





distillation.mo

Hi,
Functions required are in Functions package, Database has values required for those functions, Model is distillation. If I simulate distillation.mo, it fails at compilation.

-Swaroop

Edited by: swaroop.katta - Jun-21-17 11:01:49
Attachments:
#7907  Permalink Top

Re: Compilation failed though equations and variables are equal in number

Jun-21-17 09:50:36

Where is `Thermodynamic_Functions` definied?

I get the following error message:

Code:

[Functions.mo:19:5-19:82:writable] Error: Class Thermodynamic_Functions.HV not found in scope Functions.HLiqId (looking for a function or record).

Error: Error occurred while flattening model distillation

#7908  Permalink Top

Re: Compilation failed though equations and variables are equal in number

Jun-21-17 11:02:40

Hi,
I'm sorry.
Seems like changing the attachment is not working! can you please change line 19 in Functions.mo package from "Thermodynamic_Functions.HV()" to just "Functions.HV()"  (remove "Thermodynamic_") and run distillation.mo

-Swaroop



Edited by: swaroop.katta - Jun-21-17 11:46:57
#7914  Permalink Top

Re: Compilation failed though equations and variables are equal in number

Jun-22-17 17:48:33

Hi again,
Here are the things that went wrong on my side: I declared an array of size 10 but in for loop i used 11th element of that array in an equation. Checking and instantiation didn't consider that 11th element (that variable was simply neglected ). However while compiling it considered that variable which was not declared in the first place (I checked C file). So, I made a change to that equation and it worked fine.

I think it would be better if OM gives a warning that array size has been extended.

Thanks,
Swaroop.

#7915  Permalink Top

Re: Compilation failed though equations and variables are equal in number

Jun-22-17 19:10:01

Thanks, now I see the issue. I will bring it up in the weekly developer meeting.

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